git: kernel - Add kern.ipc.soaccept_reuse and set default to 1

Matthew Dillon dillon at
Wed May 1 11:35:56 PDT 2019

commit 2d5847e29ce41ed5553ed7b2c2bebfc938618f33
Author: Matthew Dillon <dillon at>
Date:   Wed May 1 11:31:50 2019 -0700

    kernel - Add kern.ipc.soaccept_reuse and set default to 1
    * This feature, enabled by default, allows a service listening on
      a socket to be killed and restarted without causing
      "bind: Address already in use" errors due to accepted connections still
      being present.
    * The accepted connections may still be present either because they
      are still in active use (though typically this is not the case when
      a service is killed... its children also get killed).  But also, more
      importantly, if the sockets are still present due to lingering on a
      TCP timeout.
      In both of these situations we allow bind() to ignore matches against
      accepted connections.  This allows a service to be restared without
      having to set SO_REUSEADDR (for example named/bind generally does not
      set SO_REUSEADDR and restarting can be a pain).

Summary of changes:
 sys/kern/uipc_socket2.c | 20 +++++++++++++-------
 sys/netinet/in_pcb.c    | 15 ++++++++++++---
 sys/sys/socketvar.h     |  1 +
 3 files changed, 26 insertions(+), 10 deletions(-)

DragonFly BSD source repository

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